package com.nowcoder.community.service;

import com.nowcoder.community.dao.LoginTicketMapper;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

@Service
public class UserService implements CommunityConstant {
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private TemplateEngine templateEngine;
    @Autowired
    private MailClient mailClient;
    @Value("${community.path.domain}")
    private String domain;
    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id){
        return userMapper.selectById(id);
    }

    //根据用户名查找用户
    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }

    //注册用户，发送激活邮件
    public Map<String,Object> register(User user){
        //错误信息用map封装
        Map<String, Object> map = new HashMap<>();
        //空值判断
        if(user==null){
            throw new IllegalArgumentException("用户不能为空！");
        }
        if(StringUtils.isBlank(user.getUsername())){
            map.put("usernameMsg","用户名不能为空！");
            return map;
        }
        if(StringUtils.isBlank(user.getPassword())){
            map.put("passwordMsg","密码不能为空！");
            return map;
        }
        if(StringUtils.isBlank(user.getEmail())){
            map.put("emailMsg","邮箱不能为空！");
            return map;
        }
        //注意：以下map的key值看似与上面重复，但是因为两者不可能同时存入，所以没有重复
        //验证用户名
        User u = userMapper.selectByName(user.getUsername());
        if(u!=null){
            map.put("usernameMsg","该用户名已存在！");
            return map;
        }
        //验证邮箱
        u=userMapper.selectByEmail(user.getEmail());
        if(u!=null){
            map.put("emailMsg","该邮箱已被注册！");
            return map;
        }

        //注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword()+user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());

        userMapper.insertUser(user);

        //发送激活邮件
        Context context = new Context();
        context.setVariable("email",user.getEmail());
        // http://localhost:8080/community/activation/id/code
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活账号", content);


        return map;
    }

    //激活用户
    public int activation(int userId,String code){
        User user = userMapper.selectById(userId);
        if(user.getStatus()==1)
            return ACTIVATION_REPEAT;
        else{
            if(user.getActivationCode().equals(code)){
                userMapper.updateStatus(userId, 1);
                return ACTIVATION_SUCCESS;
            }
            else
                return ACTIVATION_FAIL;
        }
    }

    @Autowired
    private LoginTicketMapper loginTicketMapper;
    //用户登陆
    public Map<String,Object> login(String username,String password,int expiredSeconds){
        Map<String, Object> map = new HashMap<>();
        // 空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在!");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活!");
            return map;
        }

        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
        loginTicketMapper.insertLoginTicket(loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;
    }
    //用户退出
    public void logout(String ticket) {
        loginTicketMapper.updateStatus(ticket, 1);
    }

    //根据登陆凭证查询LoginTicket
    public LoginTicket findLoginTicketByTicket(String ticket){
        return loginTicketMapper.selectByTicket(ticket);
    }
    //更新用户头像
    public int updateHeader(int userId,String headerUrl){
        return userMapper.updateHeader(userId, headerUrl);
    }
}
